Radiant heater



FIG. 1 is a perspective view of a radiant heater, showing our new design;

FIG. 2 is a right side elevational view thereof, shown on a larger scale, the left side being identical thereto;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a radiant heater, as shown. 